7HZ Sonus 1DD+1BA Hybrid IEM HiFi In-ear Earphones with OCC Cable7HZ Sonus 1DD+1BA Hybrid IEM HiFi In ear Earphones with Detachable High end Silver plated OCC Cable for Audiophile Musician Flawless Integration of Technology The 7Hz Sonus was meticulously designed around a single balanced armature (BA) driver combined with a powerful dynamic driver (DD). The difficulty in many hybrid IEMs is achieving a continuous and uniform sound. The Sonus focused on achieving the perfect singularity to mitigate this issue. With